Mitre back saw



FIG. 1 is a left side elevational view of the mitre back saw showing mynew design with the right side being identical but reversed;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front end elevational view thereof;

FIG. 4 is a rear end elevational view thereof; and,

FIG. 5 is a top plan view of thereof.

The ornamental design for mitre back saw, as shown and described.